Windows Device Manager refresh every minute my Pioneer DDJ-SX2

Hello. I apologize for my bad English.

Well, this is the problem: I recently acquired a controller Pioneer DDJ-SX2 and the following problem occurs to me. When I turn on the device, of course connected to the USB port, without being started Serato DJ, the Windows Device Manager intermittently, about every 45-60 seconds, produces the sound as if the controller detected again and again and the screen is refreshed.

Device Manager, when I turn on the controller, creates a new USB composite device and in the category Controllers Sound, video and game I can see a device called PIONEER DDJ-SX2.

Curiously if I go to the section playback devices, I note that puts Speakers PIONEER DDJ-SX2, "default communications device" instead of calling it default device simply, or "Audio device".

However, when I start the Serato DJ, this ends to happen and the Device Manager stays permanently, soundlessly and without continually refresh the list of devices.

Do this happen to someone else?
Does anyone know what could be happening?

I tried to plug in another port and use another USB cable, but it still occurs the same.

Specifications:
PIONEER DDJ-SX2:
Firmware Version: 1.05
Driver Version: 1.002
HP G-62 laptop with Windows 7 Ultimate x64 4Gb Ram i3
Serato DJ 1.7.6

Thanks in advance. Best Regards.